Machine for forging and sharpening rock-drills.



Patented Aug. 22, |899.

No. 63|,2-al.

(Application led June 8, 1899.)

3 Sheets-Sheet l.

(No Model.)

i VVENTOH ATTORNEYS WTNESSES.'

vl Du 'Patented Aug. 2z, |899.

No. 631,28I.

W. DALY. MACHINE FOR' FURGING AND SHABPENlN ROCK DlilLLS.v

@Appumion mea .rune a, 1899.)

3 ASmets-,Sheet V:L

Nu Modem W/TNE SSE S.'

ATrO/vEg/s Nu. 63|,28L Patented Aug. 22, |899.

w. DALY. l MACHINE FR FRGING ANDl SHAHPENING BUCK DRILLS.

(Application legi June B, 1899.)

(No Model.) 3 Sheets-$hee 3,

ATTORNEYS v m: Naim neas nu. Manmohan. o. c.

j UNITED STATES 'PATENT OFFICE.

VILLIAM DALY, OF NEAR'JOHANNESBURG, SOUTH AFRICAN REPUBLIC.

MAcHlNE FoR FORGING ANDSHARPENING ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 631,281, dated August 22, 1899.

:s Application filed June 8, 1899. Serial No. 719,832. (No model.)

To all whom, t may concern:

Be it known that l, WILLIAM DALY, a subject of the Queen of Great Britain and Ireland, and a resident at the Robinson Gold Mining Company, Limited, near-Johannesburg, in the South African' Republic, have invented certain new and useful Improvements in and Relating to Machines for Forging and Sharpening Rock-Drills and the Like, of which the following is a specification.

This invention relates to an improved ma-v chine for forging and sharpening rock-drills and tools of a similar nature, particularly those drills having more than one cutting edge, such as three-winged or star bits. y

' My invention consists of a series of rapidlyreciprocating ham mers, the direction of their blows converging toward the center, which beat the shank of the drill-bit into shape, the sharpening being performed by a rapidlyreciprocating horizontally-moving hammer which carries a cress or die shaped according to the drill which it is intended to produce.

My invention will be fully described with the aid ofV the accompanying drawings, in which- A Figure 1 shows a sectional elevation;v Fig. 2, a plan View, partly sectional; Fig. 3, an end elevation of my machine with front plate II removed.

A is a horizontal shaft provided with a flywheel or ily-wheels A/ and having a drivingpulley A2 keyed thereto by which motion is imparted to the machine, said shaft A being supported in bearings B formed in the framework of the machine. The center of the shaft is eccentrically turned, as at C, imparting a backward-and-forward motion to the block C', the end of which bears against the main horizontally-sliding block D, which is recessed at D2 to receive the end thrust of the block C'. The block D slides horizontally between guides D D', bolted to the framework of the machine, and is caused to reciprocate through 'a short distance-say one-eighth of an inchby means of the eccentric C, the recoil-springs E E forcing the block D backward and keeping it always pressed against the eccentricblock C. The block D is formed on its front face with a central boss recessed or machined to receive the shank of the particular sharpening-die F which it is intended to employ. The construction of the said die-block F will vary with the end of the drill which it is intended to sharpen-eg., if a star-bit, the dieblock F will be formed on its face with a cress in the shape of a cross, which willl correspond with the crosssectional form of the drill. The slide-block D also im part-s motion to the series of ham mers G which slide in guides G', formed in the front circular casting H,whicl1 lis bolted to the framework of the machine.

drill-bit will be of the class known as starbits. Each of the hammers G moves toward the center simultaneously, motion being imparted thereto by the toggle -links K K. The sliding block D is provided with recesses or pads L, into which the ends of the toggle- Alinks K are adapted tov be received, the ends of the toggle-links K being received into recesses or pads formed in the blocks L', fixed to the framework II'. The other ends, respectively, of the toggle-links K K' are adapted to be received into recesses formed in the block M, the lower end of which projects and is received into a recess'M, formed in the sliding hammer-block G. Each of the hammers Gis furnished with tension-springs G2, which give the hammer-'blocks G their backward motion and keep the toggle-links K K always tight in their respective recesses or seatings, so that there is no lost motion. In this manner the lnovement of the horizontal sliding block D forward also causes the hammers G G to converge, the springs E E and G2 G2 reversing the direction of the various parts. Thus the forming-hammers G G and the sharpening-hammer F all move simultaneously. V

A cutting device is adapted to the machine immediately in front of the forming-hammers G G for the purpose of cutting broken or misshapen drills before sharpening. This cutting device consists of cutters N N, bolted to blocks N' N,which slide in the same guides IOO G G as the hammer-blocks G G, being placed immediately in front of same. The sliding hammer-blocks G are furnished with front projecting pieces G3 and the cutter-blocksN, formed with a corresponding recess, so that the inward motion of the hammers G is at the same time imparted to the cutter-blocks N. O O are wedge-shapedblocks,the inclines of which bear, respectively, upon the bottom of the projections G3 and the tops of the recesses, so that as the wedges O are moved into position the cutter-blocks N are moved forward a corresponding amount, and vice versa. O' O2 are recesses or grooves formed on either iiat face of each of the wedge-shaped blocks O, and the inner faces of the hammerblocks G and the cutter-blocks N' are respectively machined to lit into said recesses O2. By this construction the various parts are held together. There are as many cutters attached to blocks N' as there are hammers G. Thus if there are four hammers G as shown in the drawings there will be four cutting-blocks N and four wedges O to operate same. Each of the wedges O is connected to a circular plate P by means of connecting-links P' P'. The plate P is adapted to be received into a recess formed in the front casting of the machine and is retained in position by the studs P2. On turning the plate P from right to left by means of the handle P3 the wedges O are moved forward, thereby compressing the cutter-blocks N' and causing the points of the cuttersbT to converge. By turning the plate P in. the opposite direction the wedges O return to their normal position, drawing the cutter-blocks N back with them, so as to be inoperative. f

In order to determine the size of the drills, there are four expanding-jaws T, which move in slidesT,form ed in the front circular casting ll. These jaws T move simultaneously inwardly and outwardly, as the ease may be, as hereinafter described,and bear upon the webs of the drill, and thus regulate the size of the drill. The jaws T T are moved by wedges T2, the inclines of which bear upon the upper ends of the jaws T, said wedges being recessed or dovetailed, as shown in Fig. 3, into the sliding jaws T. The wedges T2 are driven in or out by means of a circular plate V, provided with a number of inclines V2 on its circumference-one for each wedge. Thus as the machine in the drawings is adapted for sharpening stars-bits there will be four jaws T, and consequently four operating-wedges T2 and four circumferential inclines on the eircular plate V. On turning the circular plate V by means of the handle V in one direction the circumferential inclines will force the wedges T2 forward, thus causing the jaws T to be simultaneously moved toward one another. The ends of the wedges are furnished with projections T3, which fit into a corresponding groove formed on the inner face of the circular plate V, so as to bring back the wedges. Vhen the circular plate V is turned in the other direction, the jaws T T are carried back with the wedges by means of the dovetails aforementioned.

An index may be provided against the circular plate V, so that it may be instantly set at any desired position, according to the particular size of the drill-bit which it is intended to produce.

In order to hold the drills while the sharpening operation is being performed, a horizontal table is adapted to the front of the machine, being securely bolted thereto. The top of this table R slides horizontally toward the front of the machine, being traversed by a screw or worm R', which is carried in the bearings R2, formed in the ends of the table. This screw or worm R actuates an internal screw-nut or boss R3, which is secured to the under side of the sliding top R of the table. Motion is imparted to the said screw worm or thread through the crown-wheels R4 R4, actuated through the handle R5, situated at the side of the machine, so that in this manner the top of the table may be brought to any desired distance from the front of the machine. The top of the table is provided with a series of stops S S, which are constructed in the form of plu n gers slidin g vertically in recesses or sockets S S', formed in the sliding top R of the table. These stops orplungers S S are furnished with light springs S2 S2 beneath them,so as to be depressed into their respective sockets or recesses S S when the weight of the drill is laid upon them. The first of the series S therefore, which is so far along the table R as not to be depressed by the drill, takes the end thrust of the drill while the process of sharpening is being performed, any intermediate adjustment which may be necessary being accomplished by giving the handle R5 operating the screw-,worm R a few turns. By this construction all lengths of drills may be dealt with without altering the machine in any way.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. An improved drill-sharpening and forging machine comprising the framework H,the horizontally-sliding block carrying a sharp ening-die with means for operating said block, the hammers movable radially in guides in said framework, springs tending normally to force said ham mers outward, inclined togglearms K seated between said hammers and the framework and toggle-arms K between the sliding block and hammers, substantially as described.

2. An improved drill-sharpening and forging machine consisting in combination of a rotatory shaft A provided with an eccentrically-moving member operating ahorizontal sliding block D provided with a sharpening-die F formed with a cress to sharpen the particular shape of bit required, the series of forming-hammers sliding in guides G formed in the circular front plate and work- IOO IIO

ing toward a common center and adapted to form the shank of the bit operated from the main sliding block D through the togglelinks K K', the tension-sprifigs E E and G2 G2 front of the machine having a sliding top Rl regulated and controlled by the screw-worm R and furnished with the spring-stops S S, substantially as hereinbefore described and illustrated on the accompanying drawings.

3. An improved device for taking the longitudinal thrust of a drill While it is being sharpened consisting of a table having. a sliding top controlled by a screw-worm so that it may be brought forward or backward as required, and provided with a series ot' spring- `stops, (such as S S) which are depressed when the drill is laid upon the table so that the strain of the drill is taken by the next stop beyond the end of the drill, substantially as hereinbefore described and illustrated on the accompanying drawings.

In witness whereof I have hereunto set my hand in presence of two witnesses.

WILLIAM DALY.

Witnesses:

WILLIAM J. RoBsoN, D. LEWIS WooLF. 

